Viaduct of Guangzhou Metro Line 21

Guangzhou Metro Line 21 starts from the west of Tianhe District, passing through Luogang to Zengcheng Square. The total length of Metro Line 21 is 61.6km including 40.1km underground, 6.8km of tunnels and a 14.7km long viaduct. The viaduct consists of a single cell thin-walled continuous rigid frame with a span of 40m.